How does a movie that opens to $34 million cost just $3 million to make? Microbudget horror maestro Jason Blum says his formula is simple: Everyone works for nothing (or, in the case of The Purge, for scale).

The Universal thriller marks Blum's second microbudget teaming with his best friend, star Ethan Hawke, after the 2012 hit Sinister first paired the buddies who started a theater company in their 20s. Like Purge director James DeMonaco, the crew and even vendors, Hawke, 42, took almost no money up front in exchange for a slice of the profits.

Blum, 44, won't reveal what Hawke will make from Purge, but a source says it will far exceed his typical quote. (Sources peg the total as in the mid-seven figures.) Blum, who got his start making indie movies at Miramax in the '90s, learned that small budgets can be alluring for actors frustrated by scarce studio work who are willing to bet on themselves.

For his part, Hawke has adjusted to working with Blum. "There were no perks," he says. "No trailer, no driver, no BS, just a great role, a great director. Hell, on The Purge, I slept on his couch the whole shoot."